.banner {
    width: 840px;
    height: 346px;
    padding: 0;
    position: relative;
    overflow: hidden;
  }
.banner ul {
    position: absolute;
    list-style: none;
    padding: 0;
    left: 0;
    top: 0;
    width: 6000px;
    height: 346px;
  }
.banner ul li {
    display: none;
    position:fixed;
    left: 12px;
    top: 16px;
    width: 840px;
    height: 346px;
  }
.banner ul li.current {
    display: block;
  }
.banner .btn span {
    position: absolute;
    top: 50%;
    width: 60px;
    height: 60px;
    margin-top: -30px;
    background: url(images/gotop-arrow.png) no-repeat center center;
    cursor: pointer;
  }
.banner .btn .right-btn {
    right: 0;
    background-image: url(images/gotop-arrow-right.png);
  }
.banner ol {
    position: absolute;
    list-style: none;
    left: 45%;
    bottom: -13px;
    width: 75px;
    height: 6px;
    margin-left: -37.5px;
  }
.banner ol li {
    float: left;
    width: 7px;
    height: 6px;
    margin: 0 4px;
    border-radius: 3px;
    background-color: rgba(255,255,255,0.4);
    cursor: pointer;
  }
.banner ol li.current {
    width: 13px;
    margin: 0 1px;
    background-color: #fff;
  }